From: Alex Elder <elder@inktank.com>
Date: Thu, 11 Oct 2012 04:19:13 +0000 (-0700)
Subject: rbd: zero return code in rbd_dev_image_id()
X-Git-Tag: v3.8-rc1~21^2~57
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a0ea3a40fd20b8c66381f747c454f89d6d1f50d4;p=pandora-kernel.git

rbd: zero return code in rbd_dev_image_id()

When rbd_dev_probe() calls rbd_dev_image_id() it expects to get
a 0 return code if successful, but it is getting a positive value.

The reason is that rbd_dev_image_id() returns the value it gets from
rbd_req_sync_exec(), which returns the number of bytes read in as a
result of the request.  (This ultimately comes from
ceph_copy_from_page_vector() in rbd_req_sync_op()).

Force the return value to 0 when successful in rbd_dev_image_id().
Do the same in rbd_dev_v2_object_prefix().

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Reviewed-by: Dan Mick <dan.mick@inktank.com>
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